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Schematic of the linear summation model. A 2-feature search from Experiment 2 is depicted with the<br />
target in the left locations. An independent response is generated for both spatial frequency and<br />
orientation at each location. These responses are weighted by the d’ for the particular feature and<br />
summed. The location with the maximal weighted linear response (xt-linear or xd-linear) is chosen as the<br />
target location.<br />
Shimozaki, S.S., Eckstein, M.P. & Abbey, C.K. (2002). Stimulus information contaminates summation<br />
tests of independent neural representations of features. Journal of Vision, 2, 354-370.